Quarterly report pursuant to Section 13 or 15(d)

Fair Value Measurements and Derivatives - Amounts Recognized Within Assets and Liabilities Based on Right of Offset (Details 1)

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Fair Value Measurements and Derivatives - Amounts Recognized Within Assets and Liabilities Based on Right of Offset (Details 1) - USD ($)
$ in Thousands
Jun. 30, 2015
Dec. 31, 2014
Fair Value Disclosures [Abstract]    
Gross Amounts, Assets $ 4,906  
Gross Amounts Offset, Assets    
Total Net Amounts, Assets $ 4,906  
Gross Amounts Not Offset, Assets $ (4,906)  
Total Net Amounts, Assets    
Gross Amounts, Liabilities $ 257,624 $ 247,577
Gross Amounts Offset, Liabilities (2,819) (190)
Total Net Amounts, Liabilities 254,805 247,387
Gross Amounts Not Offset, Liabilities (142,479) (59,023)
Total Net Amounts, Liabilities $ 112,326 $ 188,364